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luaC_checkGC() is called throughout Lua in places that cause
allocations, such as OP_NEWTABLE, OP_CONCAT, etc.

While reviewing places the GC may be triggered, I noticed it is also
checked in luaD_call(). Is there a practical or theoretical reason
this is necessary? It seems the mechanism of a function call/return
itself doesn't create any new collectable objects that I can see.